Prism Sound Atlas Rack-Mountable USB Audio Interface

BH #PRATLAS • MFR #ATLAS
Prism Sound Atlas Rack-Mountable USB Audio Interface
Key Features
  • 2 RU Class-Compliant USB 2.0 Interface
  • Up to 24-Bit / 192 kHz Resolution
  • 8 x XLR-1/4" Inputs with Phantom Power
  • 2 x 1/4" Instrument Inputs
The Prism Sound Atlas is a 2 RU rack-mountable USB audio interface designed to deliver reliable precision, high-resolution, and multichannel audio I/O for musicians, vocalists, songwriters, and audio engineers in home, project, commercial, and mobile studios. Its stable clock allows operation at up to 24-bit / 192 kHz resolution with high jitter rejection. With latency as low as 0.08 ms, it is well suited for recording, overdubbing, and even send-and-return routing.
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Expected availability: 7-14 business days
$4,795.00

Important Notice

  • This item is noncancelable and nonreturnable.

Prism Sound Atlas Rack-Mountable USB Audio Interface

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Prism Sound Atlas Overview

  • 1Description
  • 2Signal Path
  • 3Verifile Technology
  • 4Reliable Quality
  • 5USB 2.0 Compatibility
  • 6Flexible I/O
  • 7Low-Latency Digital Mixer
  • 8Sample Rate Conversion & Noise Shaping
  • 9Standalone Operation
  • 10Comprehensive Indicators
  • 11Expansion Slot

The Prism Sound Atlas is a 2 RU rack-mountable USB audio interface designed to deliver reliable precision, high-resolution, and multichannel audio I/O for musicians, vocalists, songwriters, and audio engineers in home, project, commercial, and mobile studios. Its stable clock allows operation at up to 24-bit / 192 kHz resolution with high jitter rejection. With latency as low as 0.08 ms, it is well suited for recording, overdubbing, and even send-and-return routing.

Line or microphone sources can be connected via the eight XLR-1/4" combo inputs, while two front-panel 1/4" jacks accommodate instruments such as guitars or synthesizers. Phantom power is selectable as are the input pads and built-in limiters. The eight 1/4" line outputs are ideal for connection to speakers and power amps, while the front-panel 1/4" jacks offer dedicated level and mix controls for independent headphone monitoring. Additionally, digital connectivity includes RCA coaxial for S/PDIF or AES3, TOSLINK optical for S/PDIF or ADAT, and BNC for word clock. An RJ45 port is present for future AVB integration.

The Atlas is compatible with Mac OS X and Windows systems via its class-compliant USB 2.0 connectivity. An IEC power cable, USB cable, rackmount ears, and XLR to RCA adapters are included.

Signal Path

Eight analog input channels and up to ten digital input channels are available as inputs for your audio workstation software through the host computer's audio driver. Similarly, eight analog output channels, up to ten digital output channels, and stereo headphone outputs can play 20 different channels. For low-latency monitoring to headphone or main outputs, each output pair can optionally be driven from the built-in DSP mixer with an individual local mix of any selection of inputs through the controller applet. All analog inputs are electronically balanced with automatic unbalanced operation. Analog outputs are electronically balanced with bootstrapping (level is maintained if one leg is grounded).

Verifile Technology

Verifile is a radical new proprietary technology exclusive to Prism Sound, which allows computer audio streams and recorded files to be quickly checked for a wide range of clicks, errors and dropouts, without any compromise in the audio content or any additional metadata. Verifile is a fragile steganographic process, which embeds derivative data within the dither of the ADC, containing a rolling hash code which allows the audio data to be thoroughly and continuously checked. Recovery of this data from the audio stream or file enables verification that the stream or file contains exactly the audio data that was produced by the ADC at the time of recording. Any incorrect samples, missing or repeated audio segments, or any other audio errors in the resulting files can be reliably detected, providing complete confidence that the recorded file is error-free. Processing such as EQ, level changes, additional redithering, or sample-rate conversion done to a Verifile recording will result in a failure to decode the rolling hash code in the dither and hence indicate that the recording is not an original.

Reliable Quality

Prism Sound uses precise software calibration techniques in its converters to avoid the unreliability of pots and tweaks. Minimizing noise, interference, and hum was a priority in the design. All the analog circuits have galvanic isolation, while the unit's electronically balanced I/O allows it to handle common mode interference sources and trouble-free connection to unbalanced equipment.

USB 2.0 Compatibility

The Atlas is easy to connect to your computer and to your outboard gear. For both Mac and Windows platforms, there is a controller application to configure the unit and control its built-in mixer and various functions. Aside from the monitor and headphone level controls, everything else is operated solely from the Atlas controller application. The controller software opens on-screen as a separate panel alongside your existing editing software. Since the Atlas is UAC2 compliant, it will also work in recent Linux and Android builds, although no control panel is provided.

Flexible I/O

The Atlas offers eight high-grade mic preamps with software-controlled gain in 1 dB steps, individually switchable phantom power, 20 dB pads, and low noise and distortion. The XLR-1/4" combo jacks support both microphone and line input, with digitally-controlled mic gain in excess of 60 dB. Two front-panel 1/4" inputs also support direct-injection (DI) instrument connections. RIAA equalization can be selected in the controller applet on channels one and two so that turntables can be connected for archiving or sampling applications. By selecting the input type (Mic or DI), low- or high-impedance cartridges can be loaded with suitable termination impedances. All analog inputs have individually-selectable Prism Sound Overkiller peak limiters built in—just as on the ADA-8XR and Orpheus—to catch those fast transients. The Overkiller threshold automatically follows the operating line-level selection (+4 dBu or -10 dBV). Overkillers are ideal for percussive sounds, particularly drums, where headroom can be a problem.

The coaxial digital I/O can be switched in the Atlas controller applet between S/PDIF and AES3 formats. This control changes the operating voltage and the channel status format, and is complemented by two supplied adapters that provide external XLR connections for AES3 devices. The optical digital I/O ports on Atlas can also be configured as ADAT I/O. Other connections include word clock sync I/O on BNC connectors.

Low-Latency Digital Mixer

A built-in digital mixer can be configured from the host computer to provide foldback feeds to performers, each with their own stereo mix of workstation playback and any of the inputs. This provides console quality local mixing—each output has its own independent mixer, with channel strips for all inputs and workstation feeds, complete with fader, pan/balance pot, solo and mute buttons, and full metering. Strips can be stereo or mono, and the mixes are dithered with filtered coefficients, just as in a top-end digital mixer. With the Prism Sound DSP mixer, the latency is as low as 0.08 ms at a 192 kHz sampling rate.

Sample Rate Conversion & Noise Shaping

Prism Sound's renowned synchronous sample-rate conversion allows outputting to various external devices at other sampling rates. The sample rate converter can be used at the outputs as well as the inputs, and can deal with unsynchronised or wrong-rate digital inputs. The Atlas can also generate, say, a live 44.1 kHz output from a 96 kHz session. The digital output is equipped with all four Prism Sound SNS noise-shaping curves, allowing you to reduce to 16-bits for CD at mastering-house quality.

Standalone Operation

Atlas can also operate in a standalone mode using its ADAT or coaxial digital I/O connections. Once configured via the Atlas controller applet, the unit can be disconnected from the host computer and used independently. Atlas will retain its settings when powered down; and even if it is switched off, Atlas can be repowered, and standalone operation can continue with the automatically stored settings.

Comprehensive Indicators

With ten multi-segment bargraphs with overload indication (assignable to inputs or outputs), Overkiller LEDs, digital input lock-status indication, sample rate conversion and host/master sync LEDs, and illuminated volume controls, the Atlas makes viewing interface activity easy.

Expansion Slot

The expansion slot supports Prism Sound's MDIO expansion cards, which provide alternative host connections. The host is usually a computer, and the Atlas interface provides a means of connection between the host and the external analog and digital audio I/O ports. Without an MDIO expansion card fitted, the host connection would always default to the USB connection. The MDIO expansion slot provides an alternative host connection. It does not necessarily disable the USB port, but in the case of the Pro Tools interface MDIO-PTHDX, the USB port is switched off when the Pro Tools interface is to be used.
UPC: 669014270863

Prism Sound Atlas Specs

System RequirementsMac OS X 10.4 or later (Intel only)
Host application that supports Core Audio

Windows Vista, 7, or 8 (32- / 64-bit)
Host application that supports ASIO
Inputs8 x XLR-1/4" combo jacks(balanced or unbalanced)
2 x 1/4" TS instrument inputs (unbalanced)
1 x TOSLINK optical input (supports S/PDIF or ADAT)
1 x coaxial input (supports S/PDIF or AES3)
Outputs8 x 1/4" TRS line outputs (balanced or unbalanced)
2 x 1/4" TRS headphone outputs (unbalanced)
1 x TOSLINK optical output (supports S/PDIF or ADAT)
1 x coaxial output (supports S/PDIF or AES3)
Word Clock1 x BNC input (75 Ohms)
1 x BNC output (75 Ohms)
MIDI1 x 5-pin DIN input
1 x 5-pin DIN output
USB1 x USB Type-B
Ethernet1 x RJ45 (for future AVB expansion)
Expansion SlotMDIO (for alternative digital multichannel I/O)
Input SensitivityLine Inputs: +4 dBu (0 dBFS = +18 dBu) or -10 dBV (0 dBFS = +6 dBu)
Input ImpedanceLine Inputs: 14.5 kOhms
Mic Inputs: 5.5 kOhms
Instrument Inputs: 1 MOhm
Output LevelAnalog Outputs: +4 dBu (0 dBFS = +18 dBu) or -10 dBV (0 dBFS = +6 dBu)
Output ImpedanceBalanced: 100 Ohms
Unbalanced: 50 Ohms
BalanceOutput: >50 dB
Total Harmonic Distortion (THD)Line Inputs: -117 dB at -0.1 dBFS (0.00014%)
Mic Inputs at +10 dB Gain: -116 dB at -0.1 dBFS (0.00016%)
Mic Inputs at +40 dB Gain: -110 dB at -0.1 dBFS (0.00032%)
Analog Outputs: -107 dB at -1 dBFS (0.00045%)
THD + NLine Inputs: -111 dB at -0.1 dBFS (0.00028%)
Mic Inputs at +10 dB Gain: -108 dB at -0.1 dBFS (0.00040%)
Analog Outputs: -106 dB at -0.1 dBFS (0.00050%)
EINMic Inputs at +30 dB Gain: -128.5 dBu (0-Ohm source), -126.3 dBu (150-Ohm source)
Mic Inputs at +40 dB Gain: -130.9 dBu (0-Ohm source), -127.6 dBu (150-Ohm source)
Mic Inputs at +50 dB Gain: -131.2 dBu (0-Ohm source), -127.7 dBu (150-Ohm source)
Mic Inputs at +60 dB Gain: -131.4 dBu (0-Ohm source), -127.8 dBu (150-Ohm source)
Dynamic RangeLine Inputs: 116 dB (-60 dBFS)
Analog Outputs: 115 dB (-60 dBFS)
Gain RangeMic Inputs: 10 to 65 dB in 1 dB steps (0 dBFS = -56 to -1 dBu)
Instrument Inputs: 10 to 65 dB in 1 dB steps (0 dBFS = -38 to +17 dBu)
PadMic Inputs: -20 dB (switchable per channel)
Instrument Inputs: -18 dB
Gain Accuracy±0.05 dB
AttenuationLF Roll-Off (Line Inputs): -0.05 dB at 8 Hz, -3 dB at <1 Hz
LF Roll-Off (Mic Inputs): -0.05 dB at 20 Hz, -3 dB at 5 Hz
LF Roll-Off (Analog Outputs): -0.05 dB at 8 Hz, -3 dB at <1 Hz
HF Roll-Off (Line/Mic Inputs) at 44.1 kHz: -0.05 dB at 21.1 kHz, -3 dB at 22 kHz
HF Roll-Off (Line/Mic Inputs) at 48 kHz: -0.05 dB at 23 kHz, -3 dB at 23.9 kHz
HF Roll-Off (Line/Mic Inputs) at 96 kHz: -0.05 dB at 32 kHz, -3 dB at 47.9 kHz
HF Roll-Off (Line/Mic Inputs) at 192 kHz: -0.05 dB at 32 kHz, -3 dB at 78 kHz
HF Roll-Off (Analog Outputs) at 44.1 kHz: -0.05 dB at 21.4 kHz, -3 dB at 22 kHz
HF Roll-Off (Analog Outputs) at 48 kHz: -0.05 dB at 23.2 kHz, -3 dB at 23.9 kHz
HF Roll-Off (Analog Outputs) at 96 kHz: -0.05 dB at 32 kHz, -3 dB at 47.8 kHz
HF Roll-Off (Analog Outputs) at 192 kHz: -0.05 dB at 32 kHz, -3 dB at 76 kHz
CMRRLine Inputs (20 Hz to 20 kHz): >70 dB
Mic Inputs (50/60 Hz): >110 dB at all gains
Mic Inputs (1 kHz): >100 dB at all gains
Mic Inputs (20 kHz): >90 dB at all gains
CrosstalkLine Inputs (1 kHz): < -140 dB
Line Inputs (20 Hz to 20 kHz): < -120 dB
Analog Outputs (1 kHz): < -135 dB
Analog Outputs (20 Hz to 20 kHz): < -120 dB
Inter-Channel Differential PhaseLine Inputs (10 Hz to 5 kHz): ±0.25°
Line Inputs (5 kHz to 20 kHz): ±1.0°
Line Inputs (20 kHz to 50 kHz): ±2.0°
Analog Outputs (10 Hz to 5 kHz): ±0.4°
Analog Outputs (5 kHz to 20 kHz): ±0.25°
Analog Outputs (20 kHz to 50 kHz): ±0.5°
Built-in LimiterLine Inputs: Progressive limiter, auto-aligning, selectable per channel
FilterLine Inputs: High-pass filter, -3 dB at 80 Hz, 40 dB/decade (selectable for channels 1-4)
Phantom Power+48 VDC, switchable per channel
Supported Digital Audio StandardsS/PDIF (coaxial or TOSLINK)
ADAT or ADAT S/MUX (TOSLINK)
AES3 (coaxial)
Sample RatesS/PDIF or AES3: Up to 192 kHz
ADAT (8-Channel): Up to 48 kHz
ADAT S/MUX (4-Channel): 88.2 kHz or 96 kHz
Bit DepthDigital Input: 24-bit
Digital Output: 24-bit or reduction to 16-bit using flat TPDF dither or Prism Sound SNS (Super Noise Shaping)
AES/EBUAES3 operation via supplied XLR to RCA adapters
Channel SupportDigital Input: Channel status ignored
Digital Output: Full implementation, consumer (S/PDIF) or professional (AES3)
Sample Rate ConverterInput: Selectable at S/PDIF input (allowing input at any sample rate)
Output: Selectable at S/PDIF output (output sample rate can be referenced to word clock, digital input, or local clock at any sample rate)
Digital PerformanceInput: Bit transparency maintained (allows recording of Dolby or DTS streams)
Output: Bit transparency maintained in 24-bit mode (allows playback of Dolby or DTS streams to external decoder)
ClockingMaster: Local, word clock, S/PDIF, or ADAT
Slave: Bus master (another interface or host computer)
Clock Accuracy±50 ppm
Jitter Rejection Filter>60 dB/decade above 100 Hz
Latency0.57 ms at 44.1 kHz
0.52 ms at 48 kHz
0.2 ms at 88.2 kHz
0.18 ms at 96 kHz
0.09 ms at 176.4 kHz
0.08 ms at 192 kHz
Ambient Operating Temperature32 to 95°F / 0 to 35°C
Relative Humidity85% maximum
Fuse Rating0.5 A (T), 0.8" / 20 mm, ceramic
Power Consumption35 W
Power Requirement90 to 250 VAC, 50/60 Hz via IEC 6A connector
Dimensions (W x D x H)Desktop: 17.3 x 11.4 x 3.7" / 440 x 290 x 95 mm (including feet)
Rackmount: 19.0 x 11.4 x 3.5" / 483 x 290 x 88 mm (including rackmount ears)
Weight11 lb / 5 kg
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